<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #box{width: 100px;height:100px;background: red}
    </style>
</head>
<body>
    <h1>首页</h1>
    <div id="box"></div>
</body>
<script>
    
</script>
</html>